| 摘要 |
<p>PURPOSE:To surely perform the pull-in operation of tracking servo in a short time by cancelling a reverse azimuth status by changing the relative position of a track recorded by the difference of the rotating speed between normal capstan rotating speed and the capstan speed different from that and a reproducing head. CONSTITUTION:A logic circuit 10 continues to output a signal switch leaves a switch 13 opened by the signals from a reproducing signal detection circuit 8 and a tracking pilot signal detection circuit 9. A velocity control circuit 6 receives the output of the logic circuit 10, and performs the velocity control by changing the frequency division ratio of a reference clock from a signal processing circuit 12 so as to set the velocity control differently from the normal rotating speed. The velocity controlling signal is added on a capstan motor driving circuit 5 via an adder 14, and feeds a magnetic tape at speed different from the feed speed of a recorded track. Therefore, deviation between the recorded track and the reproducing head is generated, which eliminates the reverse azimuth state. In such a way, it is possible to surely and stably perform the pull-in operation of an ATF in a short time.</p> |
